Process of making incandescent mantles.



UNITED Srn'rns PATENT Fries.

WOODBRIDGE n. BIRGHMORE, or BROOKLYN, YORK, nssieivon or ONE-HALF TOOLARKSON A. COLLINS, on new YORK, N. Y.

eaooess F MAKING mcANnEscmc MANrLEs.

srno'rrrcn'rron forming part of Letters Patent No. 684,493, datedOctober 15, 1901. Application filed March 14, 1900. Serial No. 8i66l.(No specimens.)

To aZZ whom it may concern.-

Beit known that I, WOODBRIDGE K13111011- MORE, a citizen of the UnitedStates, residing in the borough of Brooklyn, city of New York, county ofKings, in the State of New York, have invented a new and ImprovedProcess of Making Incandescing Mantles, of which the following is aspecification.

My invention relates to that class of mantles used for the purpose ofillumination which become incandescent when subjected to aheating-flame. Such mantleshaveheretofore been made by saturating asuitable combustible fabric with a solution of those metallic earthoxids which when heated become highly incandescent, from which thefabric is then burned out, leaving a skeleton consisting entirely of themetallic earth oXids. Such mantles are extremely fragile andareexpensive to make on account of the high cost of the materialsemployed.

To the end of obviating these objections and producing mantles ofgreater rigidity and durability at less cost my invention broadlyconsists in making an incombustible mantle base, form, or skeleton whichmay be only slightly incandescent when heated, but which shall berelatively rigid and durable and which may be made of inexpensivematerials, and then giving to such form a thin coating of the metallicearth oxids, whereby all their light giving power is attained for themantle by the use of the smallest possible amount of material. In orderto accomplish this, I take any suitable combustible fabric, such as theusual well-known mantle material woven of cotton, which, either beforeor after being saturated, as hereinbefore described, is formed intomantles of any usual or desired shape and size. The mantle material Isaturate with a solution formed by adding oxid of magnesium to asolution of oxid of zinc dissolved in hydrochloric acid until thesolution is practically neutral and diluted with water until thin enoughto thoroughly penetrate and fill the pores of the fabric. The mantlefabric thus saturated having been given the shape which the mantles areto have is thoroughly dried and then exposed to a hot highly-oxygenatedflame until the woven fabric of the mantle is entirely burned out andthe metallic salts are completely oxidized, the completion of this stepbeing indicated by the mantle becoming incandescent. The mantles thusformed I then treat after cooling with a dilute solution of a mixture ofthe metallic earth oxids, which become incandescent when heated, such ashas heretofore been used in making incandescent. mantles, as is wellknown in the art, so as to cover the mantle with a thin coating of suchsolution. Preferably I apply this solution to the mantles in a finespray; but any other suitable method of application by which the desiredthin coating can be obtained may be employed, The mantles are then readyfor use. The incombustible mantle form or base formed from theoXychlorid of zinc and oxid of magnesium is much more rigid and durablethan the mantles heretofore known, and the coating of the metallic earthoxids applied to this base gives to the mantle the same lighbgivingpower possessed by those composed entirely thereof.

I am thus enabled to produce by means of my invention a rigid durablemantle of great illuminating power at an extremely low cost, since thematerials of which the base is composed are inexpensive and the amountof the expensive metallic earth oXids required is reduced to a minimum.

What I claim as new, and desire to secure by Letters Patent, is=- Theprocess of making incandescing mantles which consists in saturating acombustible fabric with a solution of oxid of magnesium in oxychlorid ofzinc, burning out the combustible fabric therefrom and coating themantle form thus made with a solution. of metallic earth oxids.

In testimony whereof I have hereunto subscribed my name this 13th day ofMarch, A. D. 1900.

WOODBRIDGE ll. BIROlllllORE.

Witnesses:

CHAS. METZ, CLARKSON A. COLLINS.

